Stop importing nixpkgs

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1710806803,
-        "narHash": "sha256-qrxvLS888pNJFwJdK+hf1wpRCSQcqA6W5+Ox202NDa0=",
+        "lastModified": 1712963716,
+        "narHash": "sha256-WKm9CvgCldeIVvRz87iOMi8CFVB1apJlkUT4GGvA0iM=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "b06025f1533a1e07b6db3e75151caa155d1c7eb3",
+        "rev": "cfd6b5fc90b15709b780a5a1619695a88505a176",
         "type": "github"
       },
       "original": {

flake.nix

@@ -6,16 +6,13 @@
     nixpkgs,
   }: let
     inherit (nixpkgs) lib;
-    genSystems = lib.genAttrs [
+    forSystems = (f: lib.genAttrs [
       "x86_64-linux"
       "aarch64-linux"
-    ];
-    pkgsFor = system: import nixpkgs {inherit system;};
+    ] (system: f nixpkgs.legacyPackages.${system}));
   in {
-    packages = genSystems (
-      system: let
-        pkgs = pkgsFor system;
-      in {
+    packages = forSystems (
+      pkgs: {
         default = pkgs.callPackage ./. {};
         static = pkgs.pkgsStatic.callPackage ./. {
           strip = true;
@@ -23,13 +20,11 @@
       }
     );
 
-    devShells = genSystems (
-      system: let
-        pkgs = pkgsFor system;
-      in {
+    devShells = forSystems (
+      pkgs: {
         default = pkgs.mkShell {
           nativeBuildInputs = with pkgs; [clang-tools];
-          inputsFrom = [self.packages.${system}.default];
+          inputsFrom = [self.packages.${pkgs.system}.default];
         };
         pyShell = pkgs.mkShell {
           nativeBuildInputs = [(pkgs.python3.withPackages (ps: with ps; [geopandas]))];
@@ -37,6 +32,6 @@
       }
     );
 
-    formatter = genSystems (system: (pkgsFor system).alejandra);
+    formatter = forSystems (pkgs: pkgs.alejandra);
   };
 }